feat(connector): add Amazon Athena connector via Glue Data Catalog (#309)

* feat(connector): add Amazon Athena connector via Glue Data Catalog

* fix(athena): address reviewer feedback

* fix(athena): wire scope discovery, fix normalizeDriver, tighten types and tests

* fix(athena): honor databases scope, wire sql-analysis dialect, harden config resolution

- introspect() limits to the configured `databases` scope instead of scanning
  every Glue database in the account (docs promised this; connector ignored it)
- add athena -> athena to sql-analysis SQLGLOT_DIALECTS so `ktx sql` and MCP
  read-only validation parse Athena SQL under the Trino grammar, not postgres
- stringConfigValue coerces a resolved-empty `env:` reference to undefined so
  optional fields fall back to their defaults (workgroup 'primary', catalog
  'AwsDataCatalog') instead of ''
- drop trailing whitespace in dialect.test.ts

* fix(athena): integrate with main's SQL/non-SQL dialect split and add dialect notes

Rebase onto main, which introduced the KtxDialect (core) vs KtxSqlDialect
(SQL-only) split for MongoDB:
- KtxAthenaDialect implements KtxSqlDialect; the connector resolves it via
  getSqlDialectForDriver so SQL-generation methods stay in scope
- add authored athena.md SQL notes for the sql_dialect_notes MCP tool, required
  now that athena resolves to the athena sqlglot dialect (dialect-notes coverage
  is derived from the warehouse-driver registry)

---------

Co-authored-by: Andrey Avtomonov <andreybavt@gmail.com>

packages/cli/package.json

@@ -51,6 +51,8 @@
     "@ai-sdk/devtools": "0.0.18",
     "@ai-sdk/google-vertex": "^4.0.134",
     "@anthropic-ai/claude-agent-sdk": "0.3.146",
+    "@aws-sdk/client-athena": "^3.1068.0",
+    "@aws-sdk/client-glue": "^3.1068.0",
     "@clack/core": "1.3.1",
     "@clack/prompts": "1.4.0",
     "@clickhouse/client": "^1.18.5",